Text and Data Mining valid from 2018-12-17
Received: 24 September 2018
Accepted: 6 December 2018
First Online: 17 December 2018
Compliance with ethical standards
: The authors have no conflicts of interest to report.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was IRB approved.